Optical glass and method for producing the same

Abstract

The application provides an optical glass and a preparation method thereof. The optical glass contains the following components in terms of mole percentage: SiO2: 13-25%; B2O3: 8-17%; Al2O3: 0-6%; BN: 0.1-8%; La2O3: 20-30%; Y2O3: 0-5%; Nb2O5: 2-8%; TiO2: 20-30%; ZrO2: 3-9%; ZnO: 0-5%; the refractive index of the optical glass is 1.99-2.05, and the Abbe number is 26-32. The optical glass has low cost, and is further beneficial to reducing the cost of an optical system. The optical glass has excellent performance, and is beneficial to improving the transmittance of the optical system in the violet light band.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical glass and a preparation method thereof, and belongs to the field of optical glasses. BACKGROUND

[0002] With the development of portable digital optical equipment towards miniaturization, thinness, and wide-angle, the demand for optical glasses with ultra-high refractive index is increasing. Optical glasses with a refractive index higher than 1.96 are generally referred to as ultra-high refractive index glasses. The use of optical imaging equipment can greatly shorten the focal length of imaging and reduce the length required for lens imaging, thereby greatly reducing the volume of the lens. At the same time, the application of optical glasses with ultra-high refractive index and ultra-high transmittance to imaging lenses can greatly improve the zooming capability of the lens, enabling light and thin imaging equipment to have a large zooming capability. In addition, the coupling of optical glasses with ultra-high refractive index and ultra-high transmittance with optical glasses with ultra-low refractive index (fluorophosphate optical glass) can effectively reduce the phase difference and chromatic aberration of the imaging equipment, and effectively improve the imaging quality of the imaging equipment.

[0003] The coupling elements between active devices and between active and passive devices in optical communication use microlenses made of optical glass materials with high transmittance and ultra-high refractive index. The focal length can be reduced to less than 0.5 mm, the volume is reduced, and the coupling efficiency can be increased to more than 90%. Although optical glasses with ultra-high refractive index are beneficial to the development of optical equipment towards miniaturization, thinness, and wide-angle, the transmittance of optical glasses with ultra-high refractive index is low in the short-wave band, which affects the overall light throughput of the optical system, and thus affects the brightness of the optical system. Therefore, it is urgent to develop optical glasses with ultra-high refractive index and high transmittance.

[0004] Chinese Patent Application CN111943502A discloses an optical glass with a refractive index of 1.90 or more and an Abbe number of 30 or more, which contains 5-15 mass% of Y2O3. Although the introduction of Y2O3 can reduce the cost of the glass, excessive introduction of Y2O3 can affect the crystallization performance of the glass and increase the difficulty of melting the glass, which is not conducive to melting the glass with excellent internal quality.

[0005] Chinese Patent Application CN102745894A discloses an optical glass with a refractive index of 1.98-2.03 and an Abbe number of 27-32, which contains 10-20 mol% of ZnO. Due to the high content of ZnO, the Pt is eroded during the melting process of the glass, which increases the difficulty of melting the glass, which is not conducive to melting the glass with excellent internal quality.

[0006] Chinese patent application CN107285622A discloses an optical glass with a refractive index of 1.75 or more and an Abbe number of 23-50, which contains 1.0-30.0% of Bi2O3. Since Bi2O3 reacts with Pt at 1200-1250℃, the melting difficulty of the glass is increased, which is not conducive to melting the glass with excellent internal quality.

[0007] Chinese patent application CN101497495A discloses an optical glass with a refractive index of more than 1.9 and an Abbe number of 38 or less, which contains 0.1-25 mass% of Ta2O5. Since the raw material of Ta2O5 is expensive, the raw material cost of the optical glass is high.

[0008] Chinese patent application CN101279816A discloses an optical glass with a refractive index of 1.8-2.2 and an Abbe number of 16-40, which is a B2O3-TeO2-La2O3 system and contains 0.2-60 mol% of TeO2. In the production process, volatile stripes are caused by TeO2, which is not conducive to the control of the stripes of the glass.

[0009] Chinese patent application CN1448353A discloses an optical glass with a refractive index of more than 1.88 and an Abbe number of 22-28, which contains 30-50 mass% of Nb2O5. Since the raw material of Nb2O5 is expensive, the raw material cost of the optical glass is high.

[0010] Chinese patent application CN1418837A discloses an optical glass with a refractive index of 1.81 or more and an Abbe number of 31 or less, which contains 12-23 mass% of BaO. The high content of BaO has strong corrosion to the melting device in the melting process of the glass raw material, which is not conducive to reducing the production cost of the glass. At the same time, the high content of BaO has strong corrosion, which is not conducive to melting the glass with excellent internal quality.

[0011] Chinese patent application CN112424134A discloses an optical glass with a refractive index of 1.75 or more and an Abbe number of 30-40, which contains 10-60 mass% of BaO. The high content of BaO has strong corrosion to the melting device in the melting process of the glass raw material, which is not conducive to reducing the production cost of the glass. At the same time, the high content of BaO has strong corrosion, which is not conducive to melting the glass with excellent internal quality.

[0012] Chinese patent application CN110234612A discloses an optical glass with a refractive index of 1.70 or more and an Abbe number of 20-50, which contains 30-65 mass% of BaO. The high content of BaO has strong corrosion to the smelting device during the melting process of the glass raw materials, which is not conducive to reducing the production cost of the glass. At the same time, it is difficult to smelt a glass with excellent internal quality due to the strong corrosion of the high content of BaO.

[0013] Chinese patent application CN110510869A discloses an optical glass with a refractive index of 1.95 or more and an Abbe number of 22-30, which contains 8-20 mass% of BaO. The high content of BaO has strong corrosion to the smelting device during the melting process of the glass raw materials, which is not conducive to reducing the production cost of the glass. At the same time, it is difficult to smelt a glass with excellent internal quality due to the strong corrosion of the high content of BaO.

[0014] Japanese patent publication 2004-155639 discloses an optical glass with a refractive index of more than 1.80 and an Abbe number of not more than 30, which contains more than 12 but less than 23 mass% of BaO. If the content of BaO is too high, the high content of BaO has strong corrosion to the smelting device during the melting process of the glass raw materials, which is not conducive to reducing the production cost of the glass. At the same time, it is difficult to smelt a glass with excellent internal quality due to the strong corrosion of the high content of BaO. SUMMARY

[0015] PROBLEMS TO BE SOLVED BY THE INVENTION

[0016] In view of the technical problems in the prior art, the present application first provides an optical glass with a refractive index (n d ) of 1.99-2.05 and an Abbe number (υ d ) of 26-32. The optical glass of the present application has low cost, which is further conducive to reducing the cost of the optical system. The optical glass of the present application has excellent performance, which is conducive to improving the transmission of the optical system in the violet light band.

[0017] Further, the present application further provides a preparation method of the optical glass, which has simple and easy-to-operate preparation method, raw materials are easy to obtain, and is suitable for mass production.

[0018] SOLUTIONS TO PROBLEMS

[0019] The present application provides an optical glass containing the following components in terms of mole percentage:

[0020] SiO2: 13%-25%;

[0021] B2O3: 8%-17%;

[0022] Al2O3: 0%-6%;

[0023] BN: 0.1%–8%;

[0024] La2O3: 20%–30%;

[0025] Y2O3: 0%–5%;

[0026] Nb2O5: 2%–8%;

[0027] TiO2: 20%–30%;

[0028] ZrO2: 3%–9%;

[0029] ZnO: 0%–5%;

[0030] The optical glass has a refractive index of 1.99 to 2.05 and an Abbe number of 26 to 32.

[0031] The optical glass according to the present invention contains, in molar percentage, the following components:

[0032] SiO2: 14%–24%;

[0033] B2O3: 9%–16%;

[0034] Al2O3: 0%–5%;

[0035] BN: 0.4%–7%;

[0036] La2O3: 22%–27%;

[0037] Y2O3: 0%–4%;

[0038] Nb2O5: 2.5%–6.5%;

[0039] TiO2: 23%–29%;

[0040] ZrO2: 3.5%–8.5%;

[0041] ZnO: 0%–4%.

[0042] According to the optical glass of the present invention, the sum of the contents of SiO2 and B2O3, ∑(SiO2+B2O3), is 26% to 39% in molar percentage; preferably 27% to 38%.

[0043] In the optical glass according to the present invention, the ratio of SiO2 content to B2O3 content, SiO2 / B2O3, is 0.8 to 2.7, preferably 0.9 to 2.6, in molar percentage.

[0044] In the optical glass according to the present invention, the sum of the contents of La2O3 and Y2O3, ∑(La2O3+Y2O3), is 21% to 33% in molar percentage; preferably 23% to 29%.

[0045] According to the optical glass of the present invention, the sum of the contents of Nb2O5 and TiO2, ∑(Nb2O5+TiO2), is 26% to 35% in molar percentage, preferably 28% to 34%.

[0046] The ratio of TiO2 content to Nb2O5 content, in molar percentage terms, is 3 to 10.5, preferably 3.5 to 10.

[0047] In the optical glass according to the present invention, the ratio of the content of TiO2 to the sum of the content of SiO2 and the content of B2O3, TiO2 / (SiO2+B2O3), is 0.5 to 1.2, preferably 0.6 to 1.1.

[0048] According to the optical glass of the present invention, the optical glass has one of the following characteristics:

[0049] The density of the optical glass is 5.05 g / cm³. 3 the following;

[0050] The crystallization temperature of the optical glass is below 1190℃;

[0051] The wavelength λ of the optical glass when its external transmittance is 70% 70 The wavelength is below 370 nm when the external transmittance is 5% and below 410 nm;

[0052] The internal transmittance τ of the 10mm thick optical glass at a wavelength of 400nm 10 It is over 80%.

[0053] According to the optical glass of the present invention, the optical glass does not contain at least one of BaO, Bi2O3, GeO2, Ta2O5, Gd2O3, Yb2O3, WO3, Li2O and TeO2.

[0054] The present invention also provides a method for preparing optical glass according to the present invention, which includes: weighing the raw materials of each component in proportion, mixing them evenly, melting them, and then pouring or casting them into a molding die, or directly pressing them into shape.

[0055] The effects of the invention

[0056] The refractive index (n) of the optical glass of this invention d The Abbe number is 1.99–2.05.d The optical glass of the present application has low cost, which is further conducive to reducing the cost of optical systems. The optical glass of the present application has excellent performance, which is conducive to improving the transmittance of the optical system in the violet light band.

[0057] Further, the preparation method of the optical glass of the present application is simple and easy to implement, raw materials are easy to obtain, and is suitable for mass production. DETAILED DESCRIPTION

[0058] Various exemplary embodiments, features, and aspects of the present application will be described in detail below. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0059] In addition, in order to better illustrate the present application, numerous specific details are given in the following detailed description. Those skilled in the art will understand that the present application can be implemented without certain specific details. In some other examples, methods, means, apparatus and steps that are well known to those skilled in the art are not described in detail in order to highlight the main idea of the present application.

[0060] Unless otherwise specified, the units used in the specification are international standard units, and the numerical values and numerical value ranges appearing in the present application should be understood to include systematic errors that are inevitable in industrial production.

[0061] In the present specification, the meaning of "may" includes both the meaning of performing a certain process and the meaning of not performing a certain process.

[0062] In the present specification, "some specific / preferred embodiments", "other specific / preferred embodiments", "embodiments", and the like refer to the specific elements (e.g., features, structures, properties, and / or characteristics) described in relation to the embodiment are included in at least one embodiment described herein, and can be present in other embodiments or can not be present in other embodiments. In addition, it should be understood that the elements can be combined in various embodiments in any suitable manner.

[0063] In the present specification, the numerical value range represented by "numerical value A to numerical value B" refers to a range including the end point numerical values A and B.

[0064] The present application first provides an optical glass containing the following components in mole percent:

[0065] SiO2: 13% to 25%, preferably 14% to 24%;

[0066] B2O3: 8% to 17%, preferably 9% to 16%;

[0067] Al2O3: 0% to 6%, preferably 0% to 5%;

[0068] BN: 0.1% to 8%, preferably 0.4% to 7%;

[0069] La2O3: 20% to 30%, preferably 22% to 27%;

[0070] Y2O3: 0% to 5%, preferably 0% to 4%;

[0071] Nb2O5: 2% to 8%, preferably 2.5% to 6.5%;

[0072] TiO2: 20% to 30%, preferably 23% to 29%;

[0073] ZrO2: 3% to 9%, preferably 3.5% to 8.5%;

[0074] ZnO: 0% to 5%, preferably 0% to 4%;

[0075] The optical glass has a refractive index of 1.99 to 2.05 and an Abbe number of 26 to 32.

[0076] The optical glass of the present application is low in cost, which is further conducive to reducing the cost of optical systems. The optical glass of the present application has excellent performance, which is conducive to improving the transmittance of the optical system in the violet light band.

[0077] The raw material introduction method adopts various forms capable of introducing compounds with corresponding contents. In the following description, the content of each component is expressed in terms of mole percentage.

[0078] SiO2 is a glass-forming oxide, which maintains the stability of the glass and maintains the viscosity suitable for forming molten glass. In the high-transmittance ultrahigh-refractive optical glass of the present application, too low a content of SiO2 will reduce the bridging oxygen content in the glass, the crystallization upper limit temperature of the glass will exceed 1230℃, and at the same time, the light transmittance performance of the glass will deteriorate; but too high a content of SiO2 will increase the difficulty of melting the glass, and bubbles, stripes and other defects are likely to occur, and the refractive index is difficult to reach 1.99 to 2.05. In the high-transmittance ultrahigh-refractive optical glass of the present application, the mole percentage content of SiO2 is controlled to be 13% to 25%, preferably 14% to 24%, for example, 15% to 23%, etc.

[0079] B2O3 is an essential component of fluxing agent in the optical glass of the present application. If the content of B2O3 is too low, the melting amount of La2O3 and Nb2O5 in the glass composition will be reduced, and the melting of each component of the optical glass at a temperature of 1350°C or below cannot be promoted; if the content of B2O3 is too high, the volatilization during the smelting process will be increased, and the glass constant and the fluctuation of the streak will be caused, and the difficulty of mass production will be increased. In the high-transmittance and super-high-refractive-index optical glass of the present application, the content of B2O3 is controlled to be 8% to 17% in terms of mole percentage, preferably 9% to 16%, for example, 10% to 15%, 11% to 14%, etc.

[0080] The present inventors have found through a large number of experiments that the sum of the contents of SiO2 and B2O3, ∑(SiO2+B2O3), has a decisive influence on the forming properties of the glass. If ∑(SiO2+B2O3) is too low, a stable glass cannot be formed; if ∑(SiO2+B2O3) is too high, the refractive index and Abbe number of the obtained glass are difficult to reach the specific range of the present application. Therefore, in the present application, the sum of the content of SiO2 and the content of B2O3, ∑(SiO2+B2O3), is 26% to 39% in terms of mole percentage; preferably 27% to 38%, for example, 28% to 37%, etc.

[0081] When the ratio of the content of SiO2 to the content of B2O3, SiO2 / B2O3, is 0.8 to 2.7 in terms of mole percentage, the viscosity of the glass can be adjusted, the stability of the formed glass is better, and the crystallization temperature of the glass is lower. However, when SiO2 / B2O3 is too high, the stability of the formed glass is poor, the crystallization temperature of the glass is greater than 1350°C, and even the glass cannot be formed. When the ratio of the content of SiO2 to the content of B2O3, SiO2 / B2O3, is preferably 0.9 to 2.6, for example, 1.0 to 2.5, the performance of the glass is more excellent.

[0082] Al2O3 can improve the thermal stability and chemical stability of the glass, increase the elasticity and hardness of the glass, and improve the mechanical strength. When the content of Al2O3 is too high, the oxygen element in the glass composition will be taken away, and [AlO4] exists in the glass, which reduces the refractive index and dispersion value of the glass. In the present application, the content of Al2O3 is controlled to be 0% to 6% in terms of mole percentage, preferably 0% to 5%, for example, 0% to 4%, etc.

[0083] In the present application, BN (boron nitride) can significantly improve the strength, toughness, elastic modulus and microhardness of the glass, and can reduce the thermal expansion coefficient of the glass. The introduction of BN in the present application can improve the transmittance of the glass in the short wave band, because BN consumes oxygen at 1200°C, reduces the reaction ability of Pt and O2, reduces the platinum content of the high-temperature glass liquid during the preparation of the glass, reduces the scattering and absorption of light in the wavelength range of 380-400 nm by Pt particles, and improves the short wave transmittance of the glass. Since the melting point of BN is as high as 3000°C, when the content of BN is too high, the Pt content during the preparation process cannot be reduced, but the internal transmittance of the glass is deteriorated. Therefore, in the present application, the content of BN is controlled to be 0.1%-8%, preferably controlled to be 0.4%-7%, for example, 0.5%-6%, etc.

[0084] The La2O3 component is an effective component for increasing the refractive index of the glass and reducing the dispersion, and is the main component of this type of high-refractive optical glass. When the content of La2O3 is too low, the refractive index and Abbe number of the glass will be difficult to reach the above-mentioned specific range; when the content of La2O3 is too high, the devitrification tendency of the glass increases, and the liquidus temperature increases. In the present application, the molar percentage content of La2O3 is controlled to be 20%-30% in terms of mole percentage, preferably controlled to be 22%-27%, for example, 23%-26%, etc.

[0085] In the present application, Y2O3 has basically the same performance as La2O3, can make the optical glass have a high refractive index and a low dispersion, and can improve the crystallization performance of the glass when appropriately added in the glass composition. However, when the content of Y2O3 is too low, the devitrification resistance performance deteriorates. In the present application, the content of Y2O3 is controlled to be 0%-5% in terms of mole percentage, preferably controlled to be 0%-4%, for example: 0%-3%, etc.

[0086] The present inventors have found through a large number of experiments that in the optical glass of the present application, the sum ∑(La2O3+Y2O3) of the content of La2O3 and the content of Y2O3 has a certain influence on the performance of the optical glass. If ∑(La2O3+Y2O3) is too high in terms of mole percentage, the performance of the optical glass prepared will be poor, and at the same time the specific gravity of the glass will be greater than 5.05 g / cm 3 However, if ∑(La2O3+Y2O3) is too low, the optical constants of the glass will be difficult to reach the range of the present application. Therefore, the sum ∑(La2O3+Y2O3) of the content of La2O3 and the content of Y2O3 is controlled to be 21%-33%, preferably controlled to be 23%-29%, for example: 23.5%-27.5%, etc.

[0087] Nb2O5 has the effect of increasing the refractive index of optical glass, improving chemical stability and crystallization performance. In the present application, when the content of Nb2O5 is too low, the effect is not obvious; while when the content of Nb2O5 is too high, the crystallization performance of the glass will gradually deteriorate, and it is not easy to achieve the optical performance expected by the present application. Therefore, in the present application, the content of Nb2O5 is controlled to be 2% to 8% in terms of mole percentage, preferably 2.5% to 6.5%, for example, 3% to 6%, etc.

[0088] TiO2 is a necessary component for obtaining the optical glass of the present application, and helps to improve the crystallization performance of the glass within a suitable range. If the content of TiO2 is too low, it is difficult to obtain the required optical constants; if the content of TiO2 is too high, the crystallization performance of the glass deteriorates, and at the same time causes the glass to be colored and darkened. Therefore, in the present application, the mole percentage content of TiO2 is controlled to be 20% to 30% in terms of mole percentage, preferably 23% to 29%, for example, 24% to 28%, etc.

[0089] The present inventors have found through a large number of experiments that in the optical glass of the present application, the sum of the content of Nb2O5 and the content of TiO2 ∑(Nb2O5+TiO2) and the ratio of the content of TiO2 to the content of Nb2O5 TiO2 / Nb2O5 have a great influence on the formation of the glass. When ∑(Nb2O5+TiO2) is too high, stable glass cannot be formed, but when ∑(Nb2O5+TiO2) is too low, the purpose of the present application cannot be achieved. Therefore, the sum of the content of Nb2O5 and the content of TiO2 ∑(Nb2O5+TiO2) is controlled to be 26% to 35%, preferably 28% to 34%, for example, 29% to 33%, etc.

[0090] When TiO2 / Nb2O5 is suitable, TiO2 more enters the random network structure of the glass as network former [TiO4], making the glass more stable, and the larger TiO2 / Nb2O5 is, the more conducive to improving the short-wave transmittance of the glass. When TiO2 / Nb2O5 is too high, the glass-forming ability is poor, the crystallization temperature of the glass is high, and it is not conducive to improving the transmittance. This is mainly because TiO2 is an aliovalent element, which coexists with Ti 3+ and Ti 4+ in the glass. At this time, TiO2 more exists as network modifier [TiO6] tetragonal bipyramid structure, which is conducive to improving the transmittance of the glass, but it destroys the random network structure of the glass, which is not conducive to the formation of the glass. When TiO2 / Nb2O5 is too low, the refractive index and Abbe number of the optical glass cannot be better matched to the optical constant range of the present application. Therefore, in the present application, the ratio of the content of TiO2 to the content of Nb2O5 TiO2 / Nb2O5 is controlled to be 3 to 10.5, preferably 3.5 to 10, for example, 4 to 9.5.

[0091] The present inventors have found that when the content of TiO2 is controlled to be 0.5 to 1.2, preferably 0.6 to 1.1, relative to the sum of the content of SiO2 and the content of B2O3, i.e. TiO2 / (SiO2+B2O3), the transmittance of the glass can be improved, for example, 0.7 to 1.0, etc.

[0092] ZrO2 has the effect of improving the optical constants and increasing the resistance to devitrification and chemical stability of the optical glass, and in lanthanide series glasses, it also has the effect of increasing the refractive index and decreasing the dispersion. In the present application, ZrO2 is an essential additive component, but if the content of ZrO2 is too low, the effect is not obvious; if the content of ZrO2 is too high, the devitrification performance of the glass will deteriorate, and the melting difficulty will increase, affecting the quality of the glass melting. In the present application, the content of ZrO2 is controlled to be 3% to 9% by mole, preferably 3.5% to 8.5%, for example, 4% to 7.5%, etc.

[0093] ZnO can reduce the devitrification tendency of the optical glass, reduce the linear expansion coefficient of the glass, and increase the chemical stability and mechanical strength of the glass. In the present application, if the content of ZnO is too high, it will increase the erosion of the melting device during the melting process, and it will be difficult to melt the glass with good internal quality. In the present application, the content of ZnO should be controlled to be 0% to 5% by mole, preferably 0% to 4%, for example, 0% to 3%.

[0094] Further, in the present application, the optical glass has one of the following characteristics:

[0095] The density of the optical glass is 5.05 g / cm 3 The following;

[0096] The devitrification temperature of the optical glass is 1190°C or lower;

[0097] The wavelength λ 70 at which the external transmittance is 5% is 370 nm or lower at 410 nm or lower;

[0098] The internal transmittance τ 10 of the optical glass is 80% or higher at a wavelength of 400 nm for a thickness of 10 mm.

[0099] Further, the optical glass of the present application can not contain TeO2 component which is easy to cause volatile striation, thereby avoiding the generation of volatile striation; can not introduce BaO, thereby reducing the corrosion to the smelting device in the glass production process and reducing the production cost of the glass; and can not introduce expensive GeO2, Ta2O5, Gd2O3, WO3 and other components. In addition, for better achieving the purpose of the present application, the present application emphasizes that the optical glass can not contain Li2O component which has corrosion effect on the smelting device and can destroy the network structure of the glass and make the glass crystallization performance worse, and Yb2O3 which has an absorption peak in the violet light band. Since Bi2O3 reacts with Pt at 1200-1250℃, the smelting difficulty of the glass is increased, which is not conducive to smelting the glass with excellent internal quality, therefore, the optical glass of the present application preferably does not contain Bi2O3.

[0100] In addition, in order to ensure the spectral transmittance of the optical glass of the present application, the optical glass provided by the present application does not artificially introduce other elements which can be colored except the above components: V, Mo, Cr, Mn, Fe, Co, Ni, Cu and Ag. At the same time, compounds containing the following harmful elements: Th, Cd, Tl, Os, Be, Se, Pb, As, Hg and fluoride are also not artificially introduced.

[0101] The present application also provides a preparation method of the optical glass according to the present application, comprising: weighing the raw materials of each component according to the proportion, mixing uniformly, then smelting, and then pouring or pouring into a forming mold for forming, or directly pressing into shape.

[0102] Specifically, the raw materials with a purity of more than 99% used in the optical glass are weighed according to the specified proportion respectively, mixed uniformly, and then stirred and melted at 1380-1400℃ in a crucible made of precious metal such as platinum. After melting and stirring uniformly, the glass test materials can be prepared by pouring into a mold and slowly cooling, and then processed into optical glass samples.

[0103] In addition, the present application also provides an optical element comprising the optical glass according to the present application.

[0104] Embodiments

[0105] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. The specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The reagents or instruments used are not specified by the manufacturer, and are all conventional products that can be obtained by purchase.

[0106] Examples 1-30

[0107] Raw materials such as SiO2, B2O3, Al2O3, BN, La2O3, Y2O3, Nb2O5, TiO2, ZrO2, and ZnO are selected from those used in optical glass, which have a purity greater than 99% and are derived from quartz sand, boric acid, aluminum hydroxide, boron nitride, lanthanum trioxide, yttrium trioxide, niobium pentoxide, titanium dioxide, zirconium dioxide, and zinc oxide. These materials are weighed and mixed uniformly according to the molar percentages shown in Tables 1-5, then added to a platinum crucible and melted and stirred at 1390℃ for approximately 3 hours. After uniform stirring, the mixture is poured into a mold and slowly cooled to obtain glass samples. These samples are then processed into high-refractive-index optical glass samples.

[0108] Performance testing

[0109] The refractive index (nd), Abbe number (υd), and wavelength λ corresponding to an external transmittance of 70% of the optical glasses prepared in Examples 1-30 and Comparative Examples 1-5 were tested using the test methods described below. 70 When the external transmittance reaches 5%, the corresponding internal transmittance τ at wavelength λ5 and 400nm is... 10 Density (ρ), glass transition temperature (Tg), glass sag temperature (Ts), and liquidus temperature (L) T The test results are shown in the table.

[0110] 1. Refractive index n d Abbe number υ d :

[0111] The test was performed according to the test method of GB / T7962.1 standard.

[0112] 2, λ 70 With λ5

[0113] A glass specimen with a thickness of 10±0.1 mm and optically polished parallel planes is prepared. An incident light of intensity I is then injected into the glass specimen from a direction perpendicular to the planes. in The intensity I of the transmitted light is measured. out The strength is greater than I out / I in This is called the external transmittance of the glass.

[0114] In the wavelength range of 200–700 nm, the wavelength corresponding to an external transmittance of 70% is denoted as λ. 70 The wavelength corresponding to an external transmittance of 5% is denoted as λ5.

[0115] 3. Internal transmittance τ at 400nm 10 :

[0116] The internal transmittance is the transmittance without the loss of the sample surface reflection. The transmittance of the 10mm and 50mm thick samples with bubble level 1 and striation level B is measured by using the Hitachi UH4150 UV-VIS-NIR spectrophotometer, and the internal transmittance of the 10mm sample is obtained by the following formula:

[0117]

[0118] In the formula: τ 10 —10mm sample internal transmittance; T 10 , T 50 —transmittance of the 10mm and 50mm thick samples (including surface loss);

[0119] 4. Density (ρ)

[0120] The measurement is performed according to the method specified in GB / T 7962.20-87.

[0121] 5. Liquidus temperature L T :

[0122] The GM-N16P gradient furnace of Benyan Company, Japan is used to measure the liquidus temperature L T .

[0123] 6. Glass transition temperature Tg:

[0124] The glass transition temperature (Tg) is tested by using the TMA tester of PE Company, USA.

[0125] Table 1: Examples 1-6

[0126]

[0127] Table 2: Examples 7-12

[0128]

[0129] Table 3: Examples 13-18

[0130]

[0131] Table 4: Examples 19-24

[0132]

[0133] Table 5: Examples 25-30

[0134]

[0135] As can be seen from Tables 1-5, the optical glass of Examples 1-30 of the present application has not only the refractive index (n d) and Abbe number (υ d λ70 is the wavelength at which the optical glass has an external transmittance of 70%, 70 λ5 is the wavelength at which the optical glass has an external transmittance of 5% at 410 nm; the internal transmittance τ10 of the optical glass of 10 mm thickness is more than 80% at a wavelength of 400 nm, 10 and the density is 5.05 g / cm 3 Hereinafter, the glass has a crystallization temperature of 1190°C or less, has a low liquidus temperature and good processability, and is suitable for mass production.

[0136] It should be noted that although the technical solutions of the present application are described with specific examples, those skilled in the art can understand that the present application should not be limited thereto.

[0137] The above has described various embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles, practical application or technical improvement in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. An optical glass, characterized by, consists of the following components in mole percent: SiO2: 13% to 25%; B2O3: 8% to 17%; Al2O3: 0% to 6%; BN: 0.1% to 3%; La2O3: 20% to 30%; Y2O3: 0% to 5%; Nb2O5: 2% to 8%; TiO2: 26.1% to 30%; ZrO2: 3% to 9%; ZnO: 0% to 5%; The optical glass has a refractive index of 1.99 to 2.05 and an Abbe number of 26 to 32.

2. The optical glass according to claim 1, characterized by consists of the following components in mole percent: SiO2: 14% to 24%; B2O3: 9% to 16%; Al2O3: 0% to 5%; BN: 0.4% to 3%; La2O3: 22% to 27%; Y2O3: 0% to 4%; Nb2O5: 2.5% to 6.5%; TiO2: 26.1% to 29%; ZrO2: 3.5% to 8.5%; ZnO: 0% to 4%.

3. The optical glass according to claim 1, characterized by The sum of the content of SiO2 and the content of B2O3, ∑(SiO2+B2O3), is 26% to 39% in mole percent.

4. The optical glass according to claim 3, characterized by The sum of the content of SiO2 and the content of B2O3, ∑(SiO2+B2O3), is 27% to 38% in mole percent.

5. Optical glass according to any one of claims 1 to 4, characterized in that The ratio of the content of SiO2 to the content of B2O3, SiO2 / B2O3, is 0.8 to 2.7 in mole percent.

6. The optical glass according to claim 5, characterized by The ratio of the content of SiO2 to the content of B2O3, SiO2 / B2O3, is 0.9 to 2.6 in mole percent.

7. Optical glass according to any one of claims 1 to 4, characterized in that The sum of the content of La2O3 and the content of Y2O3, ∑(La2O3+Y2O3), is 21% to 33% in mole percent.

8. The optical glass according to claim 7, characterized by The sum of the content of La2O3 and the content of Y2O3, ∑(La2O3+Y2O3), is 23% to 29% in mole percent.

9. The optical glass according to any one of claims 1 to 4, characterized by, The sum of the content of Nb2O5 and the content of TiO2, ∑(Nb2O5+TiO2), is 26% to 35% in mole percent. The ratio of the content of TiO2 to the content of Nb2O5, TiO2 / Nb2O5, is 3 to 10.5 in mole percent.

10. The optical glass according to claim 9, characterized by The sum of the content of Nb2O5 and the content of TiO2, ∑(Nb2O5+TiO2), is 28% to 34% in mole percent. The ratio of the content of TiO2 to the content of Nb2O5, TiO2 / Nb2O5, is 3.5 to 10 in mole percent.

11. The optical glass according to any one of claims 1 to 4, characterized by, The ratio of the content of TiO2 to the sum of the content of SiO2 and the content of B2O3, TiO2 / (SiO2+B2O3), is 0.5 to 1.

2.

12. The optical glass according to claim 11, characterized by The ratio of the content of TiO2 to the sum of the content of SiO2 and the content of B2O3, TiO2 / (SiO2+B2O3), is 0.6 to 1.

1.

13. The optical glass according to any one of claims 1 to 4, characterized by, The optical glass has one of the following characteristics: The optical glass has a density of 5.05 g / cm 3 The following: The optical glass has a crystallization temperature of 1190°C or lower; The wavelength λ at which the optical glass has an external transmittance of 70% 70 At 410 nm or less, the wavelength at which the external transmittance is 5% is 370 nm or less; 10 mm thickness of the optical glass at a wavelength of 400 nm internal transmittance τ 10 is 80% or more.

14. A method of producing an optical glass according to any one of claims 1 to 13, characterized by, comprises: After the raw materials of each component are weighed, mixed uniformly, and then melted, they are poured or poured into a forming mold, or directly pressed into a shape.

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